#!/usr/bin/env python3
"""Google Tasks collector."""

import json
import os
import sys
from datetime import datetime
from pathlib import Path

# Add gmail venv to path for Google API libraries
venv_site = Path.home() / ".claude/mcp/gmail/venv/lib/python3.14/site-packages"
if str(venv_site) not in sys.path:
    sys.path.insert(0, str(venv_site))

# Google Tasks API
try:
    from google.oauth2.credentials import Credentials
    from google_auth_oauthlib.flow import InstalledAppFlow
    from google.auth.transport.requests import Request
    from googleapiclient.discovery import build

    GOOGLE_API_AVAILABLE = True
except ImportError:
    GOOGLE_API_AVAILABLE = False


SCOPES = ["https://www.googleapis.com/auth/tasks.readonly"]
TOKEN_PATH = Path.home() / ".gmail-mcp/tasks_token.json"
CREDS_PATH = Path.home() / ".gmail-mcp/credentials.json"


def get_credentials():
    """Get or refresh Google credentials for Tasks API."""
    creds = None

    if TOKEN_PATH.exists():
        creds = Credentials.from_authorized_user_file(str(TOKEN_PATH), SCOPES)

    if not creds or not creds.valid:
        if creds and creds.expired and creds.refresh_token:
            creds.refresh(Request())
        else:
            if not CREDS_PATH.exists():
                return None
            flow = InstalledAppFlow.from_client_secrets_file(str(CREDS_PATH), SCOPES)
            creds = flow.run_local_server(port=0)

        TOKEN_PATH.write_text(creds.to_json())

    return creds


def fetch_tasks(max_results: int = 10) -> list:
    """Fetch tasks from Google Tasks API."""
    if not GOOGLE_API_AVAILABLE:
        return [{"error": "Google API libraries not installed"}]

    try:
        creds = get_credentials()
        if not creds:
            return [
                {
                    "error": "Tasks API not authenticated - run: ~/.claude/mcp/gmail/venv/bin/python ~/.claude/skills/morning-report/scripts/collectors/gtasks.py --auth"
                }
            ]

        service = build("tasks", "v1", credentials=creds)

        # Get default task list
        tasklists = service.tasklists().list(maxResults=1).execute()
        if not tasklists.get("items"):
            return []

        tasklist_id = tasklists["items"][0]["id"]

        # Get tasks
        results = (
            service.tasks()
            .list(
                tasklist=tasklist_id,
                maxResults=max_results,
                showCompleted=False,
                showHidden=False,
            )
            .execute()
        )

        tasks = results.get("items", [])
        return tasks

    except Exception as e:
        return [{"error": str(e)}]


def format_tasks(tasks: list, max_display: int = 5) -> str:
    """Format tasks - no LLM needed, structured data."""
    if not tasks:
        return "No pending tasks"

    if len(tasks) == 1 and "error" in tasks[0]:
        return f"⚠️ Could not fetch tasks: {tasks[0]['error']}"

    lines = []

    # Count and header
    total = len(tasks)
    due_today = 0
    today_str = datetime.now().strftime("%Y-%m-%d")

    for task in tasks:
        due = task.get("due", "")
        if due and due.startswith(today_str):
            due_today += 1

    header = f"{total} pending"
    if due_today > 0:
        header += f", {due_today} due today"
    lines.append(header)

    # List tasks
    for task in tasks[:max_display]:
        title = task.get("title", "(No title)")
        due = task.get("due", "")

        due_str = ""
        if due:
            try:
                due_date = datetime.fromisoformat(due.replace("Z", "+00:00"))
                if due_date.date() == datetime.now().date():
                    due_str = " (due today)"
                elif due_date.date() < datetime.now().date():
                    due_str = " (overdue!)"
                else:
                    due_str = f" (due {due_date.strftime('%b %d')})"
            except ValueError:
                pass

        lines.append(f"  • {title}{due_str}")

    if total > max_display:
        lines.append(f"  ... and {total - max_display} more")

    return "\n".join(lines)


def collect(config: dict) -> dict:
    """Main collector entry point."""
    tasks_config = config.get("tasks", {})
    max_display = tasks_config.get("max_display", 5)

    tasks = fetch_tasks(max_display + 5)
    formatted = format_tasks(tasks, max_display)

    has_error = tasks and len(tasks) == 1 and "error" in tasks[0]

    return {
        "section": "Tasks",
        "icon": "✅",
        "content": formatted,
        "raw": tasks if not has_error else None,
        "count": len(tasks) if not has_error else 0,
        "error": tasks[0].get("error") if has_error else None,
    }


if __name__ == "__main__":
    import sys

    if "--auth" in sys.argv:
        print("Starting Tasks API authentication...")
        creds = get_credentials()
        if creds:
            print(f"✅ Authentication successful! Token saved to {TOKEN_PATH}")
        else:
            print("❌ Authentication failed")
        sys.exit(0)

    config = {"tasks": {"max_display": 5}}
    result = collect(config)
    print(f"## {result['icon']} {result['section']}")
    print(result["content"])